[issue17643] Expose weakref callback for introspection purposes.

[Mark Dickinson]

Mark Dickinson added the comment:

Committed, using support.gc_collect for the test that requires garbage collection.  Thanks for the reviews!

----------
assignee:  -> mark.dickinson
resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17643>
_______________________________________